Portable spa shell



FIG. 1 is a first perspective view of the portable spa shell of the invention;

FIG. 2 is a second perspective view of the portable spa shell illustrated in FIG. 1;

FIG. 3 is a top plan view of the portable spa shell illustrated in FIG. 1;

FIG. 4 is a side elevational view of the portable spa shell illustrated in FIG. 1; the opposite side being identical; and,

FIG. 5 is a front elevational view of the portable spa shell illustrated in FIG. 1; the rear elevational view being identical.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a portable spa shell, as shown and described. 